Portable grinding-machine.



G. G. LUNDSTROM.

PORTABLE GRINDING MACHINE.

APPLICATION IILBD' JULY 21, 1913.

Patented Apr. 7, 1914.

TATES PATENT FFIQE.

PORTABLE GRINDING-MACHINE.

T 0 all whom it may concern Be it known that 1, CHARLES Gr. LUND- STROM, a citizen of the United States, residing at Des Moines, in the county of Polk and State of Iowa, have invented a certain new and useful Port-able Grinding-l/lachine, of which the following is a specification.

The object of my invention is to provide a grinding machine of simple, durable. and inexpensive construction particularly adapted to be operated from the fly wheel of an ordinary sewing machine.

More particularly it is my object to provide a portable grinding machine so constructed and arranged that it may be adjusted to be operated from the fly wheel of any ordinary sewing machine regardless of the height of said fly wheel above the table of the sewing machine. While a further object is to provide such a machine having a flexible shaft connected with a movable bracket or support designed to carry grinding too-ls.

My invention-consists in certain details, in the construction, combination and arrangement of the various parts of the device whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in the accompanying drawings, in which:

Figure 1 shows a front elevation of a sewing machine fly wheel operatively connected with a portable grinding machine embodying my invention. Fig. 2 shows a vertical sectional view of the same taken on a line at right angles to the view shown in Fig. 1. Fig. 3 shows a side elevation of a portion of the supporting stand or bracket with a grinding tool thereon and showing also the adjustable rest.

In the accompanying drawings I have used the reference numeral 10 to indicate generally the fly wheel of an ordinary sewing machine mounted upon a shaft 11.

My improved port-able grinding machine comprises a broad base or support 12 preferably provided with pads or the like 13 made of rubber or felt or other suitable material to prevent marring the sewing machine table. Screwed into the support 12 is an upright shaft 14 the lower portion of which is screw threaded, and the upper portion of which is smooth. Screwed upon the said lower portion above the support 12 is a nut 15. Slidably mounted upon the upper Specification of Letters Patent.

Application filed. July 21, 1913.

Patented Apr. '7, 1914.

Serial No. 780,382.

end of the shaft 1a is a bracket 16 having upwardly and outwardly extending arms which are bifurcated at their outer ends, and carry grooved rollers or wheels 17 designed to engage the fly wheel 10. Mounted on the shaft let-between the nut 15 and the bracket 16 is a coil spring 18. By screwing the nut 15 up and down the tension on the spring 18 may be increased or decreased, and the bracket 16 may be raised or lowered so that my machine may be used with different sewing machines regardless of the distance between the fly wheel 10 and the table of the sewing machine.

Operatively connected with one of the wheels 17 is a flexible shaft 19 which may be made of coil wire. For carrying suit-able tools operated from the shaft 19 I have provided a movable stand or support 20 having an upwardly extending arm 21 at the upper end of which is a bearing 22 for a second shaft 28 rotatably mounted in said bearing and operatively connected with the shaft 19. A member 21 is detachably mounted on the support 20 by means of the screws 21*.

Formed on the shaft 23 are hubs or flanges 2d. The outer end of the shaft 23 is somewhat reduced in size and screw threaded to receive a nut 25. On the shaft 23 between the nut 25 and the flange 24- I detachably mount the grinding or burnishing or brushing tools such as that illustrated on the drawing and indicated by the reference numeral 26. Adjustably and attachably mounted on the upwardly extending portion 21 by means of a thumb screw 27 is an arm 28, at the upper end of which is a support 29 for holding a blade of a pair of shears or the like in proper position for grinding.

In the practical use of my improved portable grinding machine the support 12 is placed beneath the fly wheel 10 of a sewing machine, and the nut 15 is adjusted to regulate the tension of the spring 18 for securing the proper frictional engagement between the wheels 17 and fly wheel 10. The stand 20 may be placed upon the sewing machine table or upon the leaf thereof in any suitable position. By turning the support 12 around the stand 20 may be placed in proper position to be convenient for the operator who may run the sewing machine from the ordinary pedal. Any suitable tool 26 may be placed on the shaft 23, and knives, shears,

and the like may be vground, silverware polished or any other desired operation may be performed.

Many of the advantages of my improved portable grinding machine may be seen from the foregoing description. The device is readily adjustable for use with different sewing machines. The use of the flexible shaft 19 makes it possible to place the stand 20 in different positions with relation to the machine fly wheel. It will be understood that the stand 20 may be made in any suitable form, and may, if desired, be provided with a clamp whereby it may be fixed to the sewing machine table. It has been seen that both the members 14 and 21 are detachable from their respective supporting stands so that the machine may be taken apart and packed in a comparatively small space for storage or transportation.

Many variations may be made in the details of the construction of my machine without departing from the essential fea tures thereof, as set forth in the following claims.

I claim as my invention:

1. In a device of the class described a sup port, an upright member mounted thereon, a bracket adjustably mounted on said upright member, said bracket having opposite outwardly and upwardly extending arms, wheels carried by said arms, and means for transmitting motion from one of said wheels.

2. In a device of the class described a support, an upright member mounted thereon, a bracket adjustably mounted on said upright member, said bracket having opposite outwardly and upwardly extending arms, wheels carried by said arms, a second support, a shaft rotatably mounted therein, means for transmitting motion from one of said wheels to said shaft, and means for mounting tools on said shaft.

3. In a device of the class described a support, an upright member mounted thereon, a bracket adjustably mounted on said upright member, said bracket having opposite outwardly and upwardly extending arms, wheels carried by said arms, a second support, a shaft rotatably mounted therein, a flexible shaft operatively connected with said shaft and with one of said wheels.

' 4:. In a device of the class described a support, an upright mounted thereon, a bracket slidably mounted on said upright having opposite upwardly and outwardly extending arms, wheels carried by said arms and designed to frictionally engage the fly wheel of a sewing machine, and a coil spring mounted on said upright between said bracket and said support. I

5. In a device of the class described a support, an upright member mounted thereon, a

bracket adjustably mounted on said upright member, said bracket having opposite outwardly and upwardly extending arms, wheels carried by said arms, a second support, a shaft rotatably mounted therein, a flexible shaft operatively connected with said shaft and with one of said wheels, and means for increasing the tension of said spring for affecting its yielding pressure on said bracket.

6. In a device of the class described, a support, an upright detachably mounted thereon, a bracket slidably mounted on said upright having opposite upwardly and outwardly extending arms, wheels carried by said arms and designed to frictionally engage the fly wheel of a sewing machine, a spring on said upright, means for varying the tension on said spring for afl'ecting its yielding pressure on said bracket, a second support, an upright detachably mounted thereon, and provided with a bearing at its upper end, a shaft mounted in said bearing, a flexible shaft operatively connected with said shaft and one of said wheels, means for mounting a tool on said first shaft.

7. In a device of the class described, a support, an upright detachably mounted thereon, a bracket slidably mounted on said upright having opposite upwardly and outwardly extending arms, wheels carried by said arms and designed to frictionally engage the'fly wheel of a sewing machine, a spring on said upright, means for varying the tension on said spring for affecting its yielding pressure on said bracket, a second support, an upright detachably mounted thereon and provided with a bearing at its upper end, a shaft mounted in said bearing, a flexible shaft operatively connected with said shaft and one of said wheels, means for mounting a tool on said first shaft, an adjustable arm carried by said second upright, and a support thereon designed to be adjacent to said tool.

8. In a device of the class described, a support, an upright mounted thereon, a bracket adjustably mounted on'said upright having upwardly and outwardly extending arms, wheels carried by said arm, a second support, an upright detachably mounted thereon having a bearing formed at its up per end, a shaft mounted in said bearing, a flexible shaft operatively connected with said first shaft and with one of said wheels, an arm adjustably mounted on said second upright having a support at its upper end.

Des Moines, Iowa, May 10th, 1913.

CHARLES Gr. LUNDSTROM.

Witnesses M. WALLACE, M. HATFIELD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, 7

Washington, D. G. 

